Midland Industries 77230 No Stop Coupling 4mm Copper

Product Description

The MIDLAND INDUSTRIES 77230 is a no-stop copper sweat coupling designed for joining two 4 mm copper tubes in a continuous straight run. Unlike standard stop couplings, the no-stop design has no internal shoulder, allowing the fitting to slide freely along the tube. This makes it the correct choice for repair work where one end of the pipe cannot be pushed back far enough to seat against a stop. The fitting is manufactured from copper and is joined using standard sweat soldering technique. Plumbers and pipefitters install this fitting in residential and light commercial plumbing and refrigeration tubing systems.

This coupling is suited for low-pressure copper tubing applications where a full-bore, unobstructed inner diameter is required across the joint. The no-stop configuration is particularly common in repair scenarios involving a cut section of existing copper line, where the technician needs to slide the fitting over the pipe before positioning it for soldering. Both connection ports are sized at 4 mm, making this a straight coupling with no reduction in line size.

Key Features

• No-stop internal design allows free axial movement along the tube before soldering
• Both ports sized at 4 mm for a straight, same-size connection
• Copper construction compatible with standard sweat soldering process
• Full-bore interior supports unobstructed flow through the joint
• Compact form factor suited for tight-space repair installations

Compatibility

Designed as an OEM-style replacement and repair fitting for 4 mm copper tubing sweat applications in residential and light commercial plumbing or refrigeration systems.

Installation Notes

Installation is performed by a licensed plumber or HVAC technician using standard sweat soldering tools including a torch, flux, and lead-free solder in compliance with applicable plumbing codes such as the IPC. Shut off and drain the water supply or depressurize the refrigerant circuit completely before cutting into the existing line. Clean the tube ends and the fitting bore with emery cloth and apply flux before heating. Do not overheat the fitting, as excess heat can damage adjacent components or cause solder to wick away from the joint.